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1 H is not a fault code it is the delay time of one hour. Try resetting the delay start time , press the button and scroll through until you get to 0, then try the machine.
We have a GE Profile dishwasher, which has the code 1H on the display and will not start.
I am trying to leave for the airport and your answer worked and is giving me some space and security leaving my family behind with a working appliance.
You are very welcome.